I find that very unlikely. Most runners tend as habit to keep themselves well hydrated anyway. However your body can only store so much, the rest is wee'd out. If the race is a 9am start then i view the day before as a crucial time. I usually take a zero high before and after a race.

Someone has suggested to me to take on board something salty as well the night before as that encourages water retention.

Might be that they have said take it before so you know your tummy won't rebel on race day but you don't need anything like that in the week before. For a half you shouldn't need anything but water as above. But wouldn't hurt if you are worried and don't mind spending the cash. If you have in every day before the race you might throw up.

As already said, it's totally unnecessary to start hydrating anything more than 24 hours in advance, and even then you wouldn't need a specific strategy unless you're a chronic under-drinker.

Anything consumed in excess will be peed out, and you don't really want to promote water retention as it can make you feel heavy and sluggish. Normal drinking - 2-3 litres per day (depending on body size and environmental temperature) is perfectly adequate.

The only benefit of using Nuun prior to race day is just to ensure that you don't 'react' to it, in that it's a good idea to train with whatever you plan to do in the race.

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